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// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package index

//          ┌─────────────────────────────────────────────┐
//          ▼                   callback                  │
// ┌────────────────────┐                                 │                ┌─────────────┐
// │ Writer1(goroutine) ├──────┐                          │        ┌──────►│Gen Metric ID│
// └────────────────────┘      │                          │        │       └─────────────┘
//                             ▼                          │        │
//                     ┌─────────────────┐  consume ┌─────┴────────┴──┐    ┌─────────────┐
//                     │ Notifier Buffer │◄─────────┤ Notifier Worker ├───►│  Tag Index  │
//                     └─────────────────┘          └─────┬────────┬──┘    └─────────────┘
//                             ▲                          │        │
// ┌────────────────────┐      │                          │        │       ┌─────────────┐
// │ Writer2(goroutine) ├──────┘                          │        └──────►│    Flush    │
// └────────────────────┘                                 │                └─────────────┘
//          ▲                   callback                  │
//          └─────────────────────────────────────────────┘
